Oversight of Security Clearances Criticized

WASHINGTON—U.S. lawmakers called Thursday for tighter oversight of the security-clearance process that failed to flag warning signs about the contractor who killed 12 people at the Washington Navy Yard in September.

Senators on the Homeland Security Committee condemned the current system as a failure that has put the national security in jeopardy. "Our process is obviously broken," said Sen. Tom Coburn (R., Okla.), who...